Abstract
Differential cross sections and photon-beam asymmetries have been measured for the γ→n→K+Σ- and γ→p→K+Σ0 reactions separately using liquid deuterium and hydrogen targets with incident linearly polarized photon beams of Eγ=1.5-2.4GeV at 0. 6<cos¡ΘcmK<1. The cross section ratio of σK+Σ-/ σK+Σ0, expected to be 2 on the basis of the isospin 1/2 exchange, is found to be close to 1. For the K+Σ- reaction, large positive asymmetries are observed, indicating the dominance of K* exchange. The large difference between the asymmetries for the K+Σ- and K+Σ0 reactions cannot be explained by simple theoretical considerations based on Regge model calculations.
Original language | English |
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Article number | 082003 |
Journal | Physical Review Letters |
Volume | 97 |
Issue number | 8 |
DOIs | |
State | Published - 2006 |